Python: Ignore non-project workspace glob matches

[luisangelrod]

Motivation & Context

Workspace project discovery currently treats every directory matched by packages/* as a project. After a package is removed or moved, a stale local directory can remain without a pyproject.toml, causing contributor commands such as uv run poe syntax to fail with FileNotFoundError.

Description & Review Guide

• What are the major changes? Filter globbed workspace members to paths that contain a pyproject.toml, and add a regression test with valid and stale package directories.
• What is the impact of these changes? Workspace task commands skip non-project glob matches while preserving explicit workspace-member behavior.
• What do you want reviewers to focus on? Whether filtering at shared project discovery is the right scope for all workspace task consumers.

Related Issue

Fixes #7508

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR is linked to an issue and there is no other open PR for this issue (see Related Issue above).
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after any language prefix) — a workflow keeps the label and title prefix in sync automatically.

[Copilot]

Pull request overview

Updates the Python workspace task utilities to avoid treating stale packages/* directories (without a pyproject.toml) as workspace projects, preventing FileNotFoundError failures during workspace-wide task execution.

Changes:

• Filter glob-expanded workspace members to only include paths that contain a pyproject.toml.
• Add a regression test covering a valid package directory alongside a stale directory match.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
python/scripts/task_runner.py	Filters globbed workspace member matches to only include directories that have a pyproject.toml.
python/scripts/tests/test_task_runner.py	Adds a regression test for ignoring stale glob matches without pyproject.toml.

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